[llvm-commits] [llvm] r135844 - in /llvm/trunk/lib/CodeGen: SpillPlacement.cpp SpillPlacement.h

[Jakob Stoklund Olesen]

Author: stoklund
Date: Fri Jul 22 22:10:19 2011
New Revision: 135844

URL: http://llvm.org/viewvc/llvm-project?rev=135844&view=rev
Log:
Add a simple method for marking blocks with interference in and out.

This method matches addLinks - All the listed blocks are considered to
have interference, so they add a negative bias to their bundles.

This could also be done by addConstraints, but that requires building a
separate BlockConstraint array.

Modified:
    llvm/trunk/lib/CodeGen/SpillPlacement.cpp
    llvm/trunk/lib/CodeGen/SpillPlacement.h

Modified: llvm/trunk/lib/CodeGen/SpillPlacement.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SpillPlacement.cpp?rev=135844&r1=135843&r2=135844&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SpillPlacement.cpp (original)
+++ llvm/trunk/lib/CodeGen/SpillPlacement.cpp Fri Jul 22 22:10:19 2011
@@ -239,6 +239,20 @@
   }
 }
 
+/// addPrefSpill - Same as addConstraints(PrefSpill)
+void SpillPlacement::addPrefSpill(ArrayRef<unsigned> Blocks) {
+  for (ArrayRef<unsigned>::iterator I = Blocks.begin(), E = Blocks.end();
+       I != E; ++I) {
+    float Freq = getBlockFrequency(*I);
+    unsigned ib = bundles->getBundle(*I, 0);
+    unsigned ob = bundles->getBundle(*I, 1);
+    activate(ib);
+    activate(ob);
+    nodes[ib].addBias(-Freq, 1);
+    nodes[ob].addBias(-Freq, 0);
+  }
+}
+
 void SpillPlacement::addLinks(ArrayRef<unsigned> Links) {
   for (ArrayRef<unsigned>::iterator I = Links.begin(), E = Links.end(); I != E;
        ++I) {

Modified: llvm/trunk/lib/CodeGen/SpillPlacement.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SpillPlacement.h?rev=135844&r1=135843&r2=135844&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SpillPlacement.h (original)
+++ llvm/trunk/lib/CodeGen/SpillPlacement.h Fri Jul 22 22:10:19 2011
@@ -96,6 +96,10 @@
   ///                   live out.
   void addConstraints(ArrayRef<BlockConstraint> LiveBlocks);
 
+  /// addPrefSpill - Add PrefSpill constraints to all blocks listed.
+  /// @param Blocks Array of block numbers that prefer to spill in and out.
+  void addPrefSpill(ArrayRef<unsigned> Blocks);
+
   /// addLinks - Add transparent blocks with the given numbers.
   void addLinks(ArrayRef<unsigned> Links);